linux-kernel - [PATCH] drm/amdgpu/gmc6: fix in case the PCI BAR is larger than the actual amount of vram

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Date:   Tue, 15 Aug 2023 14:54:45 +0800
From:   hongao <hongao@...ontech.com>
To:     alexander.deucher@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, lijo.lazar@....com, mario.limonciello@....com
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, hongao <hongao@...ontech.com>
Subject: [PATCH] drm/amdgpu/gmc6: fix in case the PCI BAR is larger than the actual amount of vram

[why]
limit visible_vram_size to real_vram_size in case
the PCI BAR is larger than the actual amount of vram.

Signed-off-by: hongao <hongao@...ontech.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
index b7dad4e67813..c0de7496bfd1 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
@@ -320,6 +320,8 @@ static int gmc_v6_0_mc_init(struct amdgpu_device *adev)
 	adev->gmc.aper_base = pci_resource_start(adev->pdev, 0);
 	adev->gmc.aper_size = pci_resource_len(adev->pdev, 0);
 	adev->gmc.visible_vram_size = adev->gmc.aper_size;
+	if (adev->gmc.visible_vram_size > adev->gmc.real_vram_size)
+		adev->gmc.visible_vram_size = adev->gmc.real_vram_size;
 
 	/* set the gart size */
 	if (amdgpu_gart_size == -1) {
-- 
2.20.1